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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08faf3505fb73bfaf9f2c432d3b7a63927ae079bb66baa7a0ff6801312161cff' 
  AND token = 'qIE2UTascww+E6lbU/G/CMXmaHY72gy5TjbWGqH0dr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}